A kind of preparation method of monolithic catalyst coated with molecular sieve
A monolithic catalyst, molecular sieve technology, applied in molecular sieve catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problems of small molecular sieve coating loading, poor molecular sieve coating strength, uncontrollable thickness, etc. Coating times and release rate, high bond strength, strong adhesion effect
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Embodiment 1
[0024] 112g of deionized water, 25g of ethyl orthosilicate and 63g of ZSM-5 molecular sieve, stir until uniform, ball mill for 8 hours, adjust the pH of the slurry with ammonia water to be 2~4 to obtain the coating slurry;
[0025] Coat the slurry uniformly on the cordierite honeycomb ceramic carrier under vacuum conditions, and blow off the excess slurry in the pores with compressed air; dry the coated sample at 120℃ for 2h, this is one coating, and then Static roasting in a muffle furnace at 550°C for 4h, with a heating rate of 5°C / min, to obtain a molecular sieve coated monolithic catalyst;
[0026] The test results of coating load rate and peeling rate are shown in Table 1.
Embodiment 2
[0028] Compared with Example 1, the difference is that 121g of deionized water, 12.5g of ethyl orthosilicate and 66.5g of ZSM-5 molecular sieve are weighed. The other processes and operating conditions are the same as those of Example 1. The coating load rate and shedding Rate test results are shown in Table 1.
Embodiment 3
[0030] Compared with Example 1, the difference is that the number of coatings is twice, and other processes and operating conditions are the same as Example 1. The test results of coating load rate and peeling rate are shown in Table 1.
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